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Intermediate infrared nonlinear optical crystal POC and preparation method thereof

A nonlinear optics and crystal technology, applied in nonlinear optics, chemical instruments and methods, optics, etc., can solve the problems of crystal application limitations, difficulty in obtaining high-quality crystals, low laser damage threshold, etc., and achieve stable furnace temperature field, High laser damage threshold, effect of reducing segregation of melt components

Inactive Publication Date: 2020-01-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Infrared nonlinear optical crystals on the market now, such as AgGaS 2 , AgGaSe 2 , ZnGeP 2 There are still shortcomings in crystals: low laser damage threshold and difficulty in obtaining high-quality crystals, which greatly restricts the application of crystals
Therefore, the study of infrared nonlinear crystals with high laser damage threshold and good optical properties is still a great challenge for nonlinear optical materials and laser technology.

Method used

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  • Intermediate infrared nonlinear optical crystal POC and preparation method thereof
  • Intermediate infrared nonlinear optical crystal POC and preparation method thereof
  • Intermediate infrared nonlinear optical crystal POC and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using PbO and PbCl 2 As the initial raw material, put the initial raw material into the condition of 80° C. for 3 hours, and take it out after natural cooling. The dried raw material was divided according to PbO:PbCl 2 =8:9 mol ratio takes by weighing, and the medicine that weighs is placed in the agate mortar, grinds 2 hours; The powder after mixing is packed in the aluminum oxide crucible, adds a cover and places in the muffle furnace, in It was kept at 420°C for 48 hours, cooled naturally to room temperature, taken out, and fully ground to obtain a POC polycrystalline material, which was analyzed by X-ray powder diffraction. Repeat the above steps to perform secondary sintering at 440°C. The powder diffraction pattern of the POC crystal synthesized by the second polycrystalline material is shown in figure 1 .

[0028] Put the ground POC polycrystalline material into the platinum crucible, place the charged crucible in the descending furnace, cover the upper openi...

Embodiment 2

[0030] Using PbO and PbCl 2 As the initial raw material, put the initial raw material into the condition of 85° C. and bake it for 4 hours, and take it out after natural cooling. The dried raw material was divided according to PbO:PbCl 2 = 8:9 molar ratio weighing, put the weighed drug in an agate mortar, grind for 1.5 hours; put the powder after mixing evenly into an alumina crucible, cover it and place it in a muffle furnace, and heat it at 430 ° C Under the conditions of heat preservation for 48 hours, naturally cooled to room temperature and then taken out, after fully grinding, the POC polycrystalline material was obtained.

[0031]Put the ground POC polycrystalline material into a platinum crucible, place the charged crucible in a descending furnace, cover the upper opening of the crucible, control the furnace temperature to 595°C, and raise the temperature slowly Temperature, when the bottom of the crucible reaches the melting point of POC, the crystal growth starts, ...

Embodiment 3

[0033] Using PbO and PbCl 2 As the initial raw material, put the initial raw material into the condition of 60° C. and bake it for 5 hours, and take it out after natural cooling. The dried raw material was divided according to PbO:PbCl 2 =8:9.5 molar ratio weighing, put the weighed medicine in an agate mortar, and grind for 1 hour; put the powder evenly mixed into an alumina crucible, cover it and place it in a muffle furnace, and heat it at 440°C Under the conditions of heat preservation for 48 hours, naturally cooled to room temperature and then taken out, after fully grinding, the POC polycrystalline material was obtained.

[0034] Put the ground POC polycrystalline material into a platinum crucible, place the charged crucible in a descending furnace, cover the upper opening of the crucible, control the furnace temperature to 570°C, and raise the temperature slowly Temperature, when the bottom of the crucible reaches the melting point of POC, crystal growth begins, the ra...

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Abstract

The invention discloses an intermediate infrared nonlinear optical crystal POC and a preparation method thereof, wherein the crystal POC is a molten compound, has a melting point of 526 DEG C, and belongs to an orthorhombic system, the space group is Fmm2(42), and the cell parameters comprise that a is 35.4963(14)angstrom, b is 5.8320(2)angstrom, c is 16.0912(6)angstrom, V is 3331.11angstrom<3>, and Z is 3. The preparation method comprises: putting uniformly mixed powder of PbCl2 and PbO into a crucible, heating, naturally cooling to a room temperature, taking out, and fully grinding to obtaina POC crystal material; putting the POC crystal material into a crucible, putting the crucible into a furnace, and heating the crystal furnace; adjusting the position of the crucible, completely andfully melting the crystal material in the crucible, descending a leading-down pipe, and carrying out crystal growth; and carrying out annealing treatment. According to the method of the invention, thevolatilization of PbO and PbCl2 is reduced, and the yield of the POC single crystal is greatly increased.

Description

technical field [0001] The invention relates to a mid-infrared nonlinear optical crystal POC (Pb 17 o 8 Cl 18 ) and a preparation method thereof, specifically relating to a crucible descent method under a semi-closed system, belonging to the technical field of crystal growth. Background technique [0002] Infrared nonlinear optical crystals have a very wide range of applications. Mid-to-far infrared coherent light sources with a wavelength range of 3-20 μm are used in the military field, such as laser infrared countermeasures, laser communication, infrared remote sensing, infrared ranging, laser aiming, etc., as well as in civilian fields, such as trace gas detection in the environment, medical diagnosis and treatment, molecular Spectroscopy and other aspects have a wide range of applications. [0003] Generally speaking, in addition to having a noncentrosymmetric structure, a nonlinear optical crystal with excellent performance should also have the following basic condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B11/00C30B29/12G02F1/355
CPCC30B11/00C30B29/12G02F1/3551
Inventor 张彦罗宽宽徐家跃储耀卿田甜申慧王洪超袁军平黄礼武余枭
Owner SHANGHAI INST OF TECH
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